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Adaptive power control algorithm for 3G cellular CDMA networks

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3 Author(s)
Nasreddine, J. ; Multimedia Networks & Services Dept., GET/ENST de Bretagne, Cesson Sevigne, France ; Nuaymi, L. ; Lagrange, X.

The proposed algorithm can be used in both link directions of the FDD mode and in the downlink of the TDD mode of UMTS, where the same closed-loop power control is used. Adaptive power control algorithms have a dynamic transmitted power update step. For these algorithms, power control steps depend on the instantaneous mobile command and the command history. Our proposed algorithm adds some intelligence to mobiles and base stations in order to limit oscillations around the target signal-to-interference ratio (SIR). When the received SIR is close to the target SIR, the receiver sends alternative up and down commands. These alternatives commands are interpreted by the transmitter. In this case, the transmitter stabilizes its transmitted power. Simulations are performed in order to evaluate the proposed algorithm performance. Simulations have shown that the proposed algorithm decreases the outage probability and dramatically reduces the transmitted power, which are the main objectives of power control algorithms.

Published in:

Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th  (Volume:2 )

Date of Conference:

17-19 May 2004

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